Means for securing mechanical members to shafts or the like



BERS' Jan. 25, 1949;

MEANS FOR TO S Fil INVENTOR ATTORNEY I I F w A2 22 1 4 im I w Patented Jan. 25, 1949 anteater MEANS FOR SECURING BEES TO SHAFTS MECHANICAL MEM- on THE LIKE Erwin W. Krause, Milwaukee, Wis., assignor to Allis-Chalmers 6 Claims.

axially relative to the taper bored member have I long been known to the prior art. Such devices are found in pipe and shaft couplings and in power transmitting connections for securing pulleys, gears, etc., in driving and driven relationship to shafts. Numerous means have been employed for clamping and unclamping such devices, chiefly involving threaded elements adapted to force the tapered sleeve member axially relative to the taper bored member. 7

The present invention is concerned with an improvement in the structural relationship of the clamping and unclamping means to sleeve and bored members of novel form and with a novel form of sleeve.

An object of the present invention concerns the creation of a clamping device which is easy and effective in operation.

Another object concerns the creation of a clamping device which is simple and inexpensive to manufacture.

Still another object concern the achievement of a structure which is compact and economical of space.

More particularly the invention concerns a novel arrangement of an inclined camming surface on one member and a movable, actuating element mounted in a mating member and actuable to movably engage theinclined camming surface of the first member in a manner to cause relative translational movement of said members, such arrangement being of particular utility in a novel combination with a tapered split sleeve mating with a taper bored hub member.

The invention having the above and still further objects and advantages which may be apparent from a full consideration of the disclosures made herein, maybe carried into practical effect as described below with reference to the accompanying drawings in which like reference characters are employed to indicate the same or similar .parts throughout the several views:

Fig. 1 of the drawing is a side view partly in section on the line II of Fig. .2, of agrooved pulley equipped with means according to the Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Application February 24, 1947,

Serial No. 730,601

present invention for securing the pulley to a machine shaft;

Fig. 2 is an end view partly in cross-section on the line II-II of the pulley shown in Fig. 1;

Fig. 3 is a detail view of the split tapered sleeve member of the pulley shown in Fig. 1;

Fig. 4 is an end view of the detail of Fig. 3;

Fig, 5 is a view of the detail of Fig. 3 taken from the rear;

Fig. 6 is a fragmentary view, partly in section on the line VI-VI of Fig. 9, of a pulley, similar to that of Fig. 1, but equipped with a modified form of securing means according to the present invention and shown with the parts in position for unclamping;

Fig. '7 is a fragmentary view similar to Fig. 6, but showing the parts in clamped position;

Fig. 8 is a fragmentary view similar to Fig. 6,

but showing the parts in position for clamping;

and

Fig. 9 is an end view of the pulley shown in Figs. 6, "I and 8 with the parts in the position as shown in Fig. 8,

In Figs.- 1-5, inclusive, of the drawing, the invention is illustrated as embodied in a grooved pulley member I. the hub 2 of which is taper bored as shown at 3 to a size considerably larger than the object to which it is desired to attach same. The pulley l is adapted for mounting in driving or driven relation on a motor shaft ll by inserting, in mating relation in the bore 3, an externally frusto-conical, split sleeve, or bushing member 6, which is bored to a size permitting a free sliding fit on shaft 4. The sleeve, or clamping ring, Bis shown as split longitudinally as by a single slot, or saw kerf, l of substantial width, so as to make the sleeve more readily contractible by pressure. The resistance to contraction by pressure may, if desirable, be still further reduced by a saw kerf 8 part way through the wall of the sleeve.

A preferred form of sleeve or clamping ring member, 6, is formed according to the present invention by broaching, or milling, or otherwise providing an oblique secant groove 9 in the tapered, or frusto-conical external surface of sleeve 6, and a second such groove If! at a mean distance from one end of sleeve 6 different from that of groove 9. Grooves 9 and H) are preferably formed on opposite sides of the sleeve and extend obliquely to the axis of the sleeve. The grooves 9 and ii! are preferably parallel sided and rectangular in cross-section, with their bottom surfaces generally in planes parallel to and spaced equally from the axis of the sleeve, and parallel to each d, securely; fastening sheave; I in. position. relae.

other. The side surfaces 9, H! and i0" are in proper alignment of grooves 9 and In with holes planes generally perpendicular to the bottom surii and i2 when sleeve 6 is inserted in the bore. faces of their respective grooves, and are oblique Pin It Will prevent insertion of sleeve 6 in an to the sleeve axis. The angles of obliquity are improper position, since all other cuts (such as preferably equal. It will be noted that groove 23, 5 kerf 3) may be made too narrow to permit entry nearest the larger end of sleeve 5, is only one of pin it. A key "may be provided, if desired, sided, since the end" surface of-th'e sleeve 6 is to, fit suitableykeywaysqin the sh-aft and sleeve intersected by the groove bottom. The surface bore and positively fix the angular relationship ii constitutes an oblique camming surface and of sleeve 6 to shaft 4,'in the usual manner.

the surfaces it and ill of groove I El constitute ioi' It will be understood that, after clamping, if similar camming surfaces for.a,purpose, which will it desired to remove-sheave I, screw M may be be described hereinbelow. removed'fromphole H and inserted in hole [2 The hub 2 is provided with a pair of guidewhere it will obliquely engage side surface I 6" ways ii and i2,preferablyinptheiformof threaded. of grooveam. as shown in Fig. 5, and may be screw holes. In Figs. 1-5, inclusive, these-are 5 actuated- -to exert aforce tending to Withdraw shown as having their axes in a commompl-an'esleeve 5-,- from-bore 3 and unclamp the same. perpendicular to the axis of .-the, bore@3-.,. It-will; Thisactiop,is; m,ore ,fully described hereinbelow be seen that these screw holes Hand 52 enter the in connection with the description of operation here (from the outside of the hub 2) in opposite relating to-Figs. 6-9, inclusive, of the drawing directions, circumferentially, preferably in paral- O which is readily applicable to both forms.

i n o i idee i r ore ah ua es- I1Q1 :S, howtthaiinvention;emdistances from the axis. The holes 1 i and I2 bo glied,ina ,Inodified forrn -of sheave; securing: are arranged generally-tangentiallywith-refermechanism There-f no oharacterahaveabeen.

ence to-the bore 3:300correspondgwithrelationship changed to a series beginninawithi llllefori'the: of-the grooves 9 ;and; I0 to the sleeveaii sothat 25 sheave; l'o-zfor the;hum-eta, allpartszbeing, given when sleeve 6 1's inserted; in? the; bore. 3,. ho1es charaeterssimilar. tethosegemployedgin Rigs-1+5, H and; i2; can simultaneously register with inclusive-,;;excep, tzthatthevareini al-seriesuberooves-9 and l9. ginnihg; With lBL; Thadevicemay be describedi The location ofholes H and i2 axially .-of bore similarly tothatdllustratcd:in; Figs-u 1 ,5 except; a and: h b iqu vnd a en ei r o o stheedi ier ncesarticularly des ribed he andil axiallyeof thesleeve B, are .sozdetermined inbelow.

with relationto-the sizes and.form-ofgthe bore 3; Holeson gyidewaysel l i: and .412 gare;;sh0wn; as.

and th r o a su f ce o 8 i h t... drille'd'on axes,vvhich arein-,axiallmspaced.paraln when. h l e ee S IW s 3 as er lei planesperpendiculamto:the;boreiaXisaatthe, t Will normally go Without f E;:-, h O 5 intersections.-of;;such:=plaines=wi=tha=plane parallel w ins eisters c tl ea he. ndn a es to thaboreaxis andlaterallyzspaced therefrom.- the small :endfgtheqsle vei th t l I I,- 50. Holes. EH and l 1:213 like;,.ll:.andiil 2; enteze ub 2 h a suitable c uai ameansq u h as c ew and penetratasbore- 31:preferab1y-L from: opposite i t a l f asing he-h l H lgaee; directions, circumferentially. SleevelilB-aisproa surface 9' at an angle. The screw it may have-a 0 videdjwith but a sjngle gro oye l63; of wjdth taxi- Conic-a1 fl ns W f the drawing, ally ofgsleeve 6); preferablyugreater; than. the.

though he l inlvmt-n eess e-t e epv diaineter of hple I llgior l 1.2;, The..si de surfaces. tion. With the sleeve in positionas; shown in; y ma indicated: byzjthev, character, a ihe eev i e st a t h e dn arme" (similar to 9') and llilfafftherfunctional.

est: h larger i f i v l iw 1101842? counterpart-I92." ofgwhichisiin asdiflerentigroove Both groove fl-lz t e e -5 1 m vand in thelforlnishownineEigsulefit. groove! Wide-z (axially When sleeve lilfi is inserted-iooselydnbore163,. thejsle'eve than the diameter vthe'fcorrfzf' with pinl ifirlocating sleeve illfi angularly relative g l H 013122130 that thelhole t0the bOl Ild-ClZ8Wi lI41151115611861:11111016 register W i lts-gmgveith-lpughgut a the'device takes a position as illustrated in -Figs.*- g a (first-yam beseenthat, fscrevz-JMnsarotated to causefurif, 6 f f i I ,3) ther penetration of bore I63 from the P05113101! penet'fala gel-into shown-:inFigsr 8 ==and 9,th'e sleeve-mfiwillbei groove;s itwillwxert alorcepniho;relatively; t inclined orihobuqueirsurface:9, whlichiwinihayeuw forced,.rbyllncllnediplane-actlon, to-theleft, to

a V wards-thepositionaslrovvn-in-F'igr 7. Sle'eve'lBBy f i fffig f q tqmovejhe' sleeve beingiforce'd:againsttheatapered surfaceof-bore l93. .towardsathersmaller end; willhbe forcedtdcontract; and clampawithin --its-=bore--anyf shaft slidablyefitting the sleeve -bore-when -the sleeve is relaxed: Fig: 7 thus illustrates themechanismin partiallyera fu'llysclamped posi-tion, with -some-- Movement of sleeve-'6 to theleft (in Fig. 1).- relative to bore. 3,; Will-- cause;-a-compression Of;: 00 sleeve G which will force it to contract, ,makingi its boreisrnaller, so that it will tightlygripshaft tivato suehhshaft' screw mhwill .\prevent.un rl clearance still availableefoz:.furtltrerclamping-acclam ing, also-:wil'l-iact-as.arkey to prevent, 6r tionii L relative rotation; between l the: sheave I 1. and If theiscrewflMAS?remoyedfmmhole"lH sleeve 5, '7 andinsertedin-holeall'2;tas.showninFigeG in" In order to-.f i11t t 1 hubl 2 may be; wardlmotiomofgtheescrew I Miawill ;byactionof provided with'a pin or keyJs extending mt theinclined;planegroollesidelifia', tendtomove bore 3,. The pin. lfitwill have suclra dimensiery 7 sleeve lilfiztothe righaiormar-directionito with-. circumferentially of bore 3- as to.;fit;-1'n slot -gor draw it fromgbore; l03;l;and;;thersleeveeI06: will: kerf l with clearancesufiicient to permit the relax or expand-Ito,.nermaltsize,.andl releaseuthe requisite contractionof sleevefiiqsfil?,a'suitable; clamping pressures. V shaft. And pin it will'beso loeatedin -hub; 2,y Afteraolampigng-ipressure hasbeen released thele- Withreferenceio holes ill -az 1 d. ,;'i2;. as -,t0-caus e, 75.:sheave-liH-mavbedrammofi theshaft;a'ndswhertiv screw H4 is retracted from bore I03, the sleeve I06 can be-freely removed from the hub I02.

In the form shown in Figs. 1-5 of the drawing, two grooves must be formed in the sleeve, but the axial length of hub portion occupied by holes H and i2 is at a minimum. This construction is accordingly advantageous where (as in the case of a sheave or pulley construction) it may be 7 necessary to provide a lateral hub extension to accommodate the holes. In such a construction it will be desirable to limit the axial length of the extension so as to cut down the overall length of the sheave or'. pulley and locate its driving surface as close as possible to a machine frame from which a shaft projects a limited distance (as motor shaft 4 in Fig. 1). The form shown in Figs. 6-9 is advantageous in that only one groove need be formed in the clamping sleeve; and this form may be preferable where no saving in overall length is required for accommodating the screw holes.

It will be understood that the invention is not intended to be restricted to the precise construction illustrated and described herein, but includes such equivalents and modifications as may readily occur to persons skilled in the art towhich it appertains, within the scope of the appended claims.

It is claimed and desired to secure by Letters Patent:

-1. A mechanism comprising a member having a tapered bore, a contractible sleeve externally formed to operably fit said bore and mounted in operable relation in said bore, an oblique groove in the external surface of said contractible sleeve forming an oblique camming surface thereon within said bore, a guideway in said member entering said bore in a generally tangential direction in a plane substantially perpendicular to said bore, axially slidably interengageable means on said sleeve and member to assure registry of said groove and guideway in assembly, and actuating means movable in said guideway and having a portion penetrating said bore when in operating position, said portion being operatively engageable with said oblique camming surface to force said member to move axially relative to said contractible sleeve.

2. In a device for clamping members to shafts, rods or pipes, the combination comprising a member having a conically tapered bore substantially larger in diameter than the object to which it is to be clamped, a split sleeve externally tapered to fit said bore and bored internally to substantially fit the object to which said member is to be clamped, said sleeve being mounted in interfitting relation in said bore, said sleeve having an axially extending slot in its external surface, an oblique groove in sleeve within said bore forming an oblique camming surface thereon, a guideway in said member entering said bore in a generally tangential direction in a plane substantially perpendicular to the axis of said bore, said member having a portion projecting radially inward of said bore and engageable with said slot in axially slidable relation to maintain registry of said groove with said guideway, and actuating means movable in said guideway and having a portion extensible into said bore and groove and into operable engagement with said oblique camming surface to force said sleeve to move axially relative to said member. 7

3. In a shaft, rod or pipe joint of the type involving a tapered contractible clamping ring, clamping mechanism comprising, a member havthe external surface of said sleeve in interfitting coaxial ing a tapered bore, a mating tapered contractible clamping ring axially movable in said bore, an obliquely extending groove in a portion of the mating surface of said ring, a pair of threaded screw holes in said member entering said bore tangentially in circumferentially opposite directions, axially slidably interengageable means on said ring and member to assure registry of said groove and holes in assembly, and an actuating screw threadedly engageable in either of said holes and operable to engage at its innermost end with a lateral surface of said groove to force said sleeve to move axially relative to said member.

4. In a shaft, rod or pipe joint of the type involving a tapered contractible clamping means, clamping mechanism comprising a member having a tapered bore, a mating tapered contractible clamping ring axially movable in said bore, a pair of obliquely extending grooves in a portion of the mating surface of said ring at different mean axial distances from one end of said ring, a pair of threaded screw holes in said member and having their longitudinal axes substantially in a common plane perpendicular to the bore axis, said holes entering said bore tangentially in circumferentially opposite directions and registering with said grooves at circumierentially opposite ends respectively through a substantial range of relative movement of said ring and member, and an actuating screw threadedly engageable with either of said holes and operable to engage at its innermost end with lateral surfaces of said grooves to force said sleeve to move axially relative to said member in either direction.

5. In a shaft, rod or pipe joint of the type involving a tapered contractible clamping ring, clamping mechanism comprising, a member having a tapered bore, a mating-tapered contractible clamping ring axially movable in said bore, an obliquely extending groove in a portion of the mating surface of said ring, a pair of threaded screw holes in said member entering said bore tangentially in circumferentially opposite directions, and an actuating screw threadedly engageable in either of said holes and operable to engage at its innermost end with a lateral surface of said groove to force said sleeve to move axially relative to said member, the axes of said holes lying at the intersections of parallel axially spaced planes perpendicular to the bore axis with a plane parallel to and spaced from the bore axis, said holes entering said bore from circumferentially opposite directions, said groove registering at opposite ends with both of said holes through a substantial range of relative movement of said sleeve and member.

6. A device for attaching a power transmission member such as pulley or the like to an element such as a shaft or the like, comprising a contractible sleeve keyed to said element in axially slidable non-rotatable relation and having a frusto-conical external surface, a tapered bore in said power transmission member to receive said relation, axially slidably interengageable means on said sleeve and power transmission member to assure assembly in predetermined relationship, a recess in the frusto-conical surface of said sleeve forming a camming surface arranged obliquely relative to the longitudinal axis of said sleeve, a guideway in said power transmission member penetrating said bore, and actuating means movably engageable with said guideway and having a portion extensible into engagement with said camming sufface toca'use'atelativeiaxiar movement fbetweeri saidzs-leeveand said power tran'smissiommember. "UNITEDSTATESPA I s ERWmLWj KRAUSE Number Name 7 L'Date Y V 1182;523 iKernaul -JSeptsZG, 1876 "REFERENCES GITED 5 2250323491 fMoreland Mar."3,'1'936 The following referencesaremf record 'inthe V 

